Improved capstan



UNITED STATES PATENT OFFICE.

WILLIAM DAKIN GRIMSHAV, OF NEW YORK, N. Y.

IM PROVED CAPSTAN.

Specification forming part of Letters Patent No. 5 l ,174, (lated November 28, 1865.

To all whom it may concern:

Be it known that I, WILLIAM D. Gain- SHAW, of the city and State of New York, have invented, made, and applied to use a certain new and useful Improvement in Gapstans; and Ido hereby declare the following to be a full, clear, and exact description of' the said invention, reference heilig had to the annexed drawings, making part of this specilication, wherein- Figure l is vertical section of the capstan through the actuating-shafts, and Fig. 2 is a section through one ofthe handspike-sockets.

Similar marks of reference denote the same parts.

ln capstans heretofore manufactured it has been usual to have pawls ou the capstan taking a circular ratchet or pawlbed. My invention has for its object the dispensing with the pawl-bed and pawls and making use of the handspike-sockets as pawls when the capstan is rotated byhandspikes setin the head of the capstan.

In the drawings, a is the base of the capstan carrying and supporting the shaft b, upon which is the capstanbarrel c, retained by the nut d on the end of b.

c are the sockets in the head ofthe capstan for receiving` the handspikes when the capstan is to be moved by power applied directly to said capstan.

f f are short shafts supported in the base a, with a bearing or journal box ou each side of the pinions g g, that gear to the wheel h on the under side of the capstan-barrel c.

z' i are ratchet-wheels secured to the shaftsf f, outside the bed a, and each ratchet-wheel is between the forks of the handspikesocket It, on the shafts f, respeetively.

l is a double-acting spring-pawl having its fulcrum iu the socket k and fitted to take the teeth of 1T, as seen in Fig. 2, so that the ratchet can be made to operate either way.

Both of the sockets k are iitted in the same manner, and it will be evident that when the hamlspike-sockcts are thrown over upon the deck the pawls of the said sockets will act as ratchets to prevent the capstan ruiming back while the said capstan is heilig worked by handspikes in the sockets e; and when it is desired to move the capstan with a slower speed and increased power the handspikes are to be inserted in thesockets k, and said sock ets an d handspikes worked simultaneously, the one moving` the capstan as the ratchet ou the other runs back over the teeth.

XVhat I claim andl desire to secure by Let ters Patent, is-

rlhe sockets k and spring-pawls l, in combination with the gear-wheels g and la and capstan c, substantially as specified, whereby a separate pawl-bed and pawls are dispensed with, as set forth.

In witness whereof I have hereunto set my signature this 11th day of October, 1865.

VILLIAM DAKIN GRIMSHAW,

Witnesses:

GEO. D. WALKER, CEAS. H. SMITH. 

